Is that a shark?!

Lumeria had walked into the water expecting a simple swim, something to cool off after the hot summer sun had fried her hair and burnt her hooves. The cool water lapped at her cloven hoofs, and as she walked in it slowly crept higher and higher until she was submerged and swimming. She swam deeper, enjoying the coolness and letting her mane flow around her and her tail Trail behind her like seaweed floating on the current. Soon she was almost out of her depth out of her comfort, and then a dark shadow slid  towards her rapidly through the water, a fin bursting through the waves beside her before disappearing back into the depths of the lagoon around her. Lumeria  immediately spun, her lease legs pumping as she frantically powered towards the shore once again.  The fright she had gotten enough that when she made her way onto the shore she jumped the last few feet onto the sand before collapsing into a less than grateful heap.  Was that a shark? Or another enivi enjoying tormenting her?

she would not be swimming again anytime soon regardless.